package com.waterworld.watch.common.util;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Looper;
import android.text.format.Time;
import android.util.Log;
import android.view.Gravity;
import android.widget.Toast;

import java.io.File;
import java.io.FileOutputStream;
import java.io.FilenameFilter;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.Arrays;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.TreeSet;

public class LauncherCrashHandler implements UncaughtExceptionHandler {

	/** Debug Log tag*/ 
	public static final String TAG = LauncherCrashHandler.class.getSimpleName();
	/** 是否开启日志输出,在Debug状态下开启, 
	* 在Release状态下关闭以提升程序性能
	* */ 
	public static final boolean DEBUG = false; 
	/** 系统默认的UncaughtException处理类 */ 
	private UncaughtExceptionHandler mDefaultHandler;
	/** CrashHandler实例 */ 
	private static volatile LauncherCrashHandler INSTANCE;
	/** 程序的Context对象 */ 
	private Context mContext;
	/** 使用Properties来保存设备的信息和错误堆栈信息*/ 
	private Properties mDeviceCrashInfo = new Properties();
	private static final String VERSION_NAME = "versionName";
	private static final String VERSION_CODE = "versionCode";
	private static final String STACK_TRACE = "STACK_TRACE";
	/** 错误报告文件的扩展名 */ 
	private static final String CRASH_REPORTER_EXTENSION = ".txt";
	
	/** 保证只有一个CrashHandler实例 */ 
	private LauncherCrashHandler() {} 
	
	/** 获取CrashHandler实例 ,单例模式*/ 
	public static LauncherCrashHandler getInstance() { 
		if (INSTANCE == null) {
			synchronized (LauncherCrashHandler.class) {
				if (INSTANCE == null) {
					INSTANCE = new LauncherCrashHandler();
				}
			}
		}
		return INSTANCE; 
	} 
	
	/** 
	* 初始化,注册Context对象, 
	* 获取系统默认的UncaughtException处理器, 
	* 设置该CrashHandler为程序的默认处理器 
	* @param ctx 
	*/ 
	public void init(Context ctx) {
		mContext = ctx; 
		mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
		Thread.setDefaultUncaughtExceptionHandler(this);
	} 
	
	/** 
	* 当UncaughtException发生时会转入该函数来处理 
	*/ 
	@Override
	public void uncaughtException(Thread thread, Throwable ex) {
		if (!handleException(ex) && mDefaultHandler != null) { 
			//如果用户没有处理则让系统默认的异常处理器来处理 
			mDefaultHandler.uncaughtException(thread, ex); 
		} else { 
			//Sleep一会后结束程序 
			try { 
				Thread.sleep(5000);
			} catch (InterruptedException e) {
				Log.d(TAG, e.toString());
			} 
			android.os.Process.killProcess(android.os.Process.myPid()); 
			System.exit(10);
		} 
	} 
	
	private void showToast(String message){
		final String msg = message;
		new Thread() {
			@Override
			public void run() { 
				Looper.prepare();
				Toast toast = Toast.makeText(mContext, "程序出错，即将退出:\r\n" + msg,
						Toast.LENGTH_LONG);
				Log.d("nh",msg);
				toast.setGravity(Gravity.CENTER, 0, 0);
				toast.show();
				Looper.loop();
			} 
		}.start(); 
	}
	
	/** 
	* 自定义错误处理,收集错误信息 
	* 发送错误报告等操作均在此完成. 
	* 开发者可以根据自己的情况来自定义异常处理逻辑 
	* @param ex 
	* @return true:如果处理了该异常信息;否则返回false 
	*/ 
	private boolean handleException(Throwable ex) {
		if (ex == null) { 
			Log.w(TAG, "handleException --- ex==null");
			return true; 
		} 
		final String msg = ex.getLocalizedMessage();
		if(msg == null) {
			return false;
		}
		//使用Toast来显示异常信息 
		//showToast(msg);
		//收集设备信息 
		collectCrashDeviceInfo(mContext); 
		//保存错误报告文件 
		saveCrashInfoToFile(ex); 
		//发送错误报告到服务器 
		//sendCrashReportsToServer(mContext); 
		return true; 
	} 
	
	/** 
	* 在程序启动时候, 可以调用该函数来发送以前没有发送的报告 
	*/ 
	public void sendPreviousReportsToServer() { 
		sendCrashReportsToServer(mContext); 
	} 
	/** 
	* 把错误报告发送给服务器,包含新产生的和以前没发送的. 
	* @param ctx 
	*/ 
	private void sendCrashReportsToServer(Context ctx) {
		String[] crFiles = getCrashReportFiles(ctx);
		if (crFiles != null && crFiles.length > 0) { 
		TreeSet<String> sortedFiles = new TreeSet<String>();
		sortedFiles.addAll(Arrays.asList(crFiles));
		for (String fileName : sortedFiles) {
		File cr = new File(ctx.getFilesDir(), fileName);
		postReport(cr); 
		cr.delete();// 删除已发送的报告 
		} 
		} 
	} 
	private void postReport(File file) {
		// TODO 发送错误报告到服务器 
	} 
	
	/** 
	* 获取错误报告文件名 
	* @param ctx 
	* @return 
	*/ 
	private String[] getCrashReportFiles(Context ctx) {
		File filesDir = ctx.getFilesDir();
		FilenameFilter filter = new FilenameFilter() {
			public boolean accept(File dir, String name) {
				return name.endsWith(CRASH_REPORTER_EXTENSION); 
			} 
		}; 
		return filesDir.list(filter); 
	} 
	
	/** 
	* 保存错误信息到文件中 
	* @param ex 
	* @return 
	*/ 
	private String saveCrashInfoToFile(Throwable ex) {
		Writer info = new StringWriter();
		PrintWriter printWriter = new PrintWriter(info);
		ex.printStackTrace(printWriter); 
		Throwable cause = ex.getCause();
		while (cause != null) { 
			cause.printStackTrace(printWriter); 
			cause = cause.getCause(); 
		} 
		String result = info.toString();
		showToast(result);
		printWriter.close(); 
		mDeviceCrashInfo.put("EXEPTION", ex.getLocalizedMessage());
		mDeviceCrashInfo.put(STACK_TRACE, result); 
		
		final StringBuffer sb = new StringBuffer();
		for (Entry<Object, Object> entry: mDeviceCrashInfo.entrySet()) {
			sb.append(entry.getKey()+" = "+entry.getValue());  
			sb.append("\n");  
		} 
		
		try { 
			//long timestamp = System.currentTimeMillis(); 
			Time t = new Time("GMT+8");
			t.setToNow(); // 取得系统时间
			int date = t.year * 10000 + t.month * 100 + t.monthDay;
			int time = t.hour * 10000 + t.minute * 100 + t.second;
			String fileName = "crash_" + date + "_" + time + CRASH_REPORTER_EXTENSION;
			FileOutputStream trace = mContext.openFileOutput(fileName,
					Context.MODE_PRIVATE);
			//mDeviceCrashInfo.store(trace, ""); 
			trace.write(sb.toString().getBytes());
			//trace.flush(); 
			trace.close(); 
			return fileName; 
		} catch (Exception e) {
			Log.d(TAG, "an error occured while writing report file..." + e);
		} 
		return null; 
	} 

	/** 
	* 收集程序崩溃的设备信息 
	* 
	* @param ctx 
	*/ 
	public void collectCrashDeviceInfo(Context ctx) {
		try { 
			PackageManager pm = ctx.getPackageManager();
			PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
					PackageManager.GET_ACTIVITIES);
			if (pi != null) { 
				mDeviceCrashInfo.put(VERSION_NAME, 
						pi.versionName == null ? "not set" : pi.versionName); 
				mDeviceCrashInfo.put(VERSION_CODE, ""+pi.versionCode); 
			} 
		} catch (NameNotFoundException e) {
			Log.e(TAG, "Error while collect package info", e);
		} 
		//使用反射来收集设备信息.在Build类中包含各种设备信息, 
		//例如: 系统版本号,设备生产商 等帮助调试程序的有用信息 
		//具体信息请参考后面的截图 
		Field[] fields = Build.class.getDeclaredFields();
		for (Field field : fields) {
			try { 
				field.setAccessible(true); 
				mDeviceCrashInfo.put(field.getName(), ""+field.get(null)); 
				if (DEBUG) { 
					Log.d(TAG, field.getName() + " : " + field.get(null));
				} 
			} catch (Exception e) {
				Log.e(TAG, "Error while collect crash info", e);
			} 
		} 
	} 

}
